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I just stumbled over this post.A friend of mine has a simliar looking casing (but with much less mycel pokingthrough the surface (maybe 15% coverd, and there are also already pins visible)

He is concerned, that the casing might be contaminated, because there are2 different colors of the casing (bright white and grey) exactly like in thepic, that you made from your casing.(click picture for enlarging it)Could this be contamination, or is this 2 color mycel normal for casings?

it's normal,it only looks gray because it's not dense and the dark coir underneath shows thru...making it appear gray. cobweb looks totaly different from myc,you'll know straight away if you ever see the stuff.

deep scratch means take a fork or something like that and scratch the top of the casing, this should help you get a better pin set. Make sure it is sterile before you do that. After you scratch it make sure you add some more vermiculite or whatever you use to cover the top. That should help out.